30
10-5. TROUBLESHOOTING FLOW
Measure the voltage between each lead wire leading
to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Is there output voltage?
Yes
No
Disconnect the terminal of the compressor. 3 minutes after turn-
ing on the power supply, start EMERGENCY OPERATION.
Is output balanced?
Yes
No
Is the input voltage to the outdoor electronic control
P.C. board 370 V or more?
Yes
No
Replace the power board.
Turn off power supply of indoor and outdoor unit, and
measure the compressor winding resistance between
the compressor terminals.
Is the resistance between each terminal normal?
Yes
No
Replace the compressor.
Reconnect the lead wire of compressor, and turn on power
supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor layer short
10 to 60 seconds: compressor lock
60 seconds to 5 minutes: refrigerant circuit defective
5 minutes or more: normal
A How to check inverter/compressor
•After the outdoor fan starts running, wait for 1 minute or more before measur-
ing the voltage.
•Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
OBH502E
